Heckendorn ii

ABSTRACT

AN APPARATUS COMBINING VOID DETECTION AT THE ENTRANCE AND MOISTURE DETECTION AT THE EXIT OF A TOW DRYER. THE VOID DETECTOR COMPRISES A PNEUMATIC SENSOR AND ASSOCIATED PRESSURE SWITCH AND RELAY ELEMENTS TO PROVIDE READOUT AND TO STOP THE DRYER MOTOR DRIVE UPON DETECTION OF A VOID. MOISTURE IS MONITORED BY A CONTINUOUS ELECTRICAL CONDUCTIVITY MEASURING APPARATUS COMPRISING A GROUNDED FEELER RIDING ABOVE AND AGAINST THE TOW AND A CONDUCTING GUIDE BELOW THE TOW WHICH IS ATTACHED TO ELECTRICAL CIRCUITRY ARRANGED NOT ONLY TO COUNT AND ALARM WHEN MOISTURE IN THE TOW EXCEEDS CERTAIN PREDETERMINED LIMITS BUT ALSO TO PROVIDE A MEASURE OF LENGTH OF SUCH MOISTURE SPOTS IN THE TOW. THE GROUNDED FEELER ALSO SERVES AS A PART OF A DETECTOR OF TOW MECHANICAL DEFECTS BY BEING MOUNTED TO THE INPUT SHAFT OF A PNEUMATIC POSITION TRANSMITTER WHICH IN TURN IS ARRANGED TO STOP THE TOW MOVING MEANS WHEN ACTUATED BY MOVEMENT OF THE FEELER AS A KNOT OR SIMILAR DEFECTS PASSES UNDER THE FEELER.   D R A W I N G

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 0.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and-sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oflice makes no assertion as tothe novelty of. the disclosed subject matter.

PUBLISHED FEBRUARY 5, 197d "Ill Slim! D SUSHI An apparatus combiningvoid detection at the entrance and moisture detection at the exit of atow dryer. The void detector comprises a pneumatic sensor and associatedpressure switch and relay elements to provide readout and to stop thedryer motor drive upon detection of a void. Moisture is monitored by acontinuous electrical conductivity measuring apparatus comprising agrounded feeler riding above and against the tow and a conducting guidebelow the tow which is attached to electrical circuitry ar ranged notonly to count and alarm when moisture in the tow exceeds certainpredetermined limits but also to provide a measure of length of suchmoisture spots in the tow. The grounded feelcr also serves as a part ofa detector of tow mechanical defects by being mounted to the input shaftof a pneumatic position transmitter which in turn is arranged to stopthe tow moving means when actuated by movement of the feeler as a knotor similar defects passes under the fecler.

1974 F. M. HECKENDORN u T919 ,003

A OMATIC CONTROL- FOR TOW DRYERS Filed May 18, 197:5

5 Sheets-Sheet 1 22 5&3 55:

If) no Feb. 5, 1974 F. M. HECKENDORN AUTOMATIC CONTROL FOR TOW mamasFiled May 18, 1973 3 Sheets-Sheet a FIG.

- SET POINT 5 Sheets-Sheet 5 AAA F. M. HECKENDORN n AUTOMATIC CONTROLFOR TOW DRYERS Feb. 5, 1974 Filed May 1 8, 1975

